#2393: Text.PrettyPrint.HughesPJ: Bug fixes, performance improvement -------------------------------------+--------------------------------- Reporter: guest | Owner: Type: bug | Status: closed Priority: normal | Milestone: 6.10.1 Component: libraries/pretty | Version: 6.8.3 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Test Case: | -------------------------------------+--------------------------------- Comment (by Thomas Miedema ): In [changeset:"67576ddc67f39bef43c473f30af0887d22011710/ghc" 67576ddc/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="67576ddc67f39bef43c473f30af0887d22011710" Pretty: bugfix fillNB (#10735) This is a backport of a bug fix by Benedikt Huber (#2393), from commit 1e50748beaa4bd2281d323b18ea51c786bba04a1 in the pretty library. From https://mail.haskell.org/pipermail/libraries/2008-June/009991.html: Law <l1> states that > sep (ps++[empty]++qs) = sep (ps ++ qs) > ...ditto hsep, hcat, vcat, fill... In the current implementation, this fails for the paragraph fill variants. > render' $ fsep [ text "c", text "c",empty, text "c", text "b"] > where render' = renderStyle (Style PageMode 7 1.4) >> c c c >> b }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/2393#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler